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IBM SVS Alerting Performance for Loitering and Crowd Formation

IBM SVS Alerting Performance for Loitering and Crowd Formation. Overview. Several short video clips were provided demonstrating the following behavior Loitering Crowds forming Stalking Rowdiness & Fighting Crowds running away (rapidly disbursing) Bag snatching

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IBM SVS Alerting Performance for Loitering and Crowd Formation

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  1. IBM SVS Alerting Performance for Loitering and Crowd Formation

  2. Overview • Several short video clips were provided demonstrating the following behavior • Loitering • Crowds forming • Stalking • Rowdiness & Fighting • Crowds running away (rapidly disbursing) • Bag snatching • SVS currently only has the ability to detect Loitering and Crowds gathering • Seven videos demonstrating these behavior were ingested into SVS to demonstrate our ability to generate an alert on these behaviors • The following slides show the results

  3. Notes • The Loitering alert will trigger on any individual who remains in the field of view for more than a set period of time. • For this test times of 20 and 60 seconds were used, determined by the length of the loitering in the video clip • Two Crowd Forming alerts were tested • Trigger when the total activity in a region exceeds a threshold (MA) • Trigger when the number of moving objects in a region exceeds a threshold (OI) • On these short clips, both versions performed well • In production the alerts would be tested over a longer time period and the version performing better with respect to hit rate and false positive rate would be used.

  4. Disk 1 • crowding.mp4 • loitering 1.mp4 • The loitering alert fired on both the target individual (left) and the officer who appeared to be directing the video (right) • loitering 2.mp4

  5. Disk 2.2 • slow gathering.mp4

  6. Disk 3.1 • slow crowding.mp4

  7. Disk 3.2 • crowding 1.mp4

  8. Disk 4.1 • slow gathering.mp4

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